Hi all me again can anybody see a problem with the schematics I made this amp from schematics on here I changed pin 4 from the original schematics from here and put 240v through a 560ohm resistor as from the original it seems to have too much voltage going to pin 4 and reading the data on 6L6 the max volts to the screen is 250v and I was getting 275volts. if I should put it back the way it was from the original supply supply schematics it to me would have to high voltage to pin 4? any input would be great thanks. the sound like the EL34B my other diy is tight and deep bass and can turn amp volume to 3/4 and Ipod at 94% without any distortion to my ears.

Thanks I have just discovered these 6L6 tubes I'm using are Russian 6N3C and they are close to 6L6G info I googled so Am I right to believe it is safe to run the Anode and screen at 300v will be acceptable?? or should I just run both at 250v to be safe? any input would be grateful

I have used soviet 6p3s for years with 450 V at UL push-pull amplifier and without any problem.

So your +Ub 300 V is fully OK.

WOW nice little unit thanks for the input will leave the amp as is, seeing 300v is fine, How do you like the tone control in your amp I was thinking about it in mine but steered away from it as others said it muddy the tone?

I use 6n3c-E from the Svetlana Factory.They are equivalent to 5881 and have a slightly higher spec than 6L6. The 6L6 GT are much smaller in power handling.

Thanks the schematics I use did say the design is for 6L6 / 5881 SE so all should be good, I need now to change my other DIY EL34B amp power as I was told 355v was at the top and should to save the valve cut power down to 320v

That tone control is active Baxandall and works really well.
One can create a muddy tone control if he does not know what he is doing.

For the same reason some tubes are told to be "bad sounding" tubes.
From almost any tube a bad and good sounding circuit can be done, but the latter is much demanding task.

Yes true, will after many searches I have come to a decision the I will run the Plate voltage from 300v - 350v and Screen from 250v - 270v with all this reading I think 300v plate and 250v screen is the best way to get the right balance from these tubes. Will rewire power source and see how it runs.